As can be seen in Fig. REF  the proposed MSEP-GS methods have similar runtime when compared with the MSEP projection methods using UQ. Moreover, the proposed MSEP-GS approaches have significantly smaller runtime when compared with the optimal B&B techniques which confirms the suitability of the proposed MSEP-GS methods as reasonable complexity performance tradeoff approaches. As also shown in Fig. REF  the proposed B&B methods have smaller runtime than the MMDDT B&B approach from [1]} for most of the SNR range analyzed and also outperforms the MMSE B&B approach from [2]} for high SNR.
